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2G 2G N/T 420A Horsepower Upgrades

2G N/T HP Upgrades

Non-turbo DSMs that were built from 1995-99 have a 2.0 liter, 140hp DOHC Chrysler 420A motor. These motors are completely different from the Mitsubishi 2.0 liter motors and their parts are not interchangeable. To get more performance out of these cars, here are suggestions gathered from countless forum posts below. Of course, some mods may not adhere to various vehicle emissions laws, and some could result in engine damage if you don't know what you're doing, so perform at your own risk.

All-Motor Upgrades
  1. Air Intake
    Replace your stock air box with a solid pipe and high-flow cone filter.
  2. Cat-back Exhaust
    Replace your stock cat-back exhaust with a higher flowing model.
  3. High Flow Cat
    Replace your stock catalytic converter with a higher flowing model.
  4. Exhaust Header
    Replace your factory exhaust manifold with a tubular steel header.
  5. Bored-out Throttle Body
    Increase the opening on your throttle body to increase air intake.
  6. Ported Intake Manifold
    Further increases air intake.
  7. Camshafts and Cam Gears
    Aggressive camshafts and cam gears allow for more power through timing adjustment.
  8. Underdrive Pulleys
    Underdrive pulleys can be added at the same time to reduce weight, which means the engine will work less to drive the accessory belts.
  9. Cylinder Head Porting
    Greatly increase air flow through the cylinder head. You may need to compensate with more fuel, which means you'll need an aftermarket Air/Fuel Controller.
  10. Air/Fuel Controller
    Allows tune-ability of the air/fuel mixture to avoid detonation and major engine damage.
  11. Ignition Timing Controller
    Allows you to control the timing.

Forced Induction Options
  1. Turbo Kit
    Bolt on a turbo kit for a huge power increase. Many of the All-Motor upgrades can and should be used along with a turbo kit for maximum power output. To learn the basics on how a turbo system works, click here.
  2. Nitrous
    The fastest and easiest way to bolt on big power. It's also the fastest and easiest way to destroy your engine if you don't know what you're doing. Read up on nitrous systems before considering one.
  3. Turbo Engine Swap
    This project is extremely time consuming, complex and expensive due to the amount of parts needed to perform the task. The parts alone can range upwards of $5000. The basic parts needed are: Engine, transmission, ECU, intercooler (and piping), fuel pump, complete exhaust system, and possibly a few more things not mentioned. The two options above are definitely better choices for the less experienced. Consider the cost of simply buying a factory turbocharged DSM before attempting this swap.
**Disclaimer -- This is copied from the site's "Tech Guide: Upgrade Paths" section; I am not the author of this information.**
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